Abstract
1. The existing methods of quenching fix the residual austenite in the structure of ShKh15 and KhVG steels. 2. The aging of tempered specimens at 130–140° for 24–48 hours does not cause any further reduction in the residual austenite and should not be recommended. 3. The aging of parts made of ShKh15 and KhVG steels at 160° reduces the amount of residual austenite by 1.5–2.5%, the most intensive decomposition occurring in the case of KhVG steel within the first 2 to 4 hours, and in the case of ShKh15 steel within the first 5–7 hours. Further soaking is technologically inadvisable. 4. Tempering at temperatures not above 160° as well as prolonged aging at 130–140° do not harden the residual austenite. Stable dimensions of parts made of ShKh15 and KhVG steels are only obtained after cold working (−30–70°) if the latter is applied immediately after quenching. 5. We can recommend the following heat treatment regime for parts made of ShKh15 or KhVG steels for fuel equipment: a) quenching from 830–840° in alkali or oil; b) cold working at −30–−70°; c) tempering at 160° for 4 or 5 hours, cooling in air; d) aging after machining for 2 or 3 hours at 160°.
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